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排序方式: 共有148条查询结果,搜索用时 218 毫秒
31.
Raza Ali Khan Muhammad Tariq Iqbal Ali Qamar Hussain Tanveer Narjis Saadia 《Environmental science and pollution research international》2021,28(30):40378-40393
Environmental Science and Pollution Research - This study was designed to investigate the impact of meteorological indicators (temperature, rainfall, and humidity) on total COVID-19 cases in... 相似文献
32.
The objective of this study was to investigate bioaccumulation of nickel (Ni) and vanadium (V) in clams living in different salinity regimes along the Saudi coast of the Arabian Gulf. Several hundred clam (Meretrix meretrix), sediment, and seawater samples were collected from 12 locations. Concentrations of Ni and V were determined in these samples using an inductively coupled argon plasma analyzer. Concentrations of Ni and V in the clams varied between 0.35 and 2.61 mg kg(-1) and between 0.13 and 0.35 mg kg(-1) wet tissue, respectively. Analysis of variance of the data revealed significant (P<0.01) inter- and intra-station variations in Ni concentrations in clams. In contrast, the mean concentration of V in clams from all the stations were statistically similar. Correlation between the biometric characteristics of clams and Ni and V concentrations were not statistically significant. Significant (P<0.05) geographical variations in Ni and V concentrations in the sediment samples were found, with relatively higher concentrations in the northern part of the Gulf where there are many oil fields. Ni and V in the sediments were significantly (P<0.05) correlated, suggesting a common contamination source for these elements. Interactions between Ni and V in clams and sediment were poor. 相似文献
33.
Solar photodegradation of dichloroacetic acid and 2,4-dichlorophenol using an enhanced photo-Fenton process 总被引:1,自引:0,他引:1
The photo-Fenton process using potassium ferrioxalate as a mediator was investigated for the photodegradation of dichloracetic acid (DCA) and 2,4-dichlorophenol (DCP) in aqueous medium using solar light as source of irradiation. The influence of the solution depth, the light intensity and the effect of stirring the solution during irradiation process were evaluated using DCA as a model compound. A negligible influence of stirring the solution was observed when the concentration of ferrioxalate (FeOx) was 0.8 mM and solution depth was 4.5 or 14 cm. The optimum FeOx concentration determined for solution depths between 4.5 and 14 cm was 0.8 mM considering total organic carbon (TOC) removal during DCA irradiation. The high efficiency of the photo-Fenton process was demonstrated on summer days, when only 10 min of exposition (around noon) were sufficient to completely destroy the organic carbon of a 1.0 mM DCA solution in the presence of 0.8 mM FeOx and 6.0 mM H2O2 using a solution depth of 4.5 cm. It was observed that the photodegradation efficiency increases linearly with the solar light intensity up to values around 15 Wm(-2) but this linear relationship does not hold above this value showing a square root dependence. The photodegradation of a solution of DCP/FeOx showed a lower TOC removal rate than that observed for DCA/FeOx, achieving approximately 90% after 35 min irradiation under 19 W m(-2), while under this light intensity, the same TOC removal of DCA/FeOx was achieved in only 10 min irradiation. 相似文献
34.
35.
Md Maksud Alam Mohammad Sujauddin Gazi Mohammed Asif Iqbal Syed Mohammed Shamsul Huda 《Waste management & research》2008,26(3):291-296
Healthcare waste management (HCWM) options are inconsistent in Bangladesh. One of the first critical steps in the process of developing a reliable waste management plan requires a comprehensive understanding of the quantities and characteristics of the waste that needs to be managed. This study took into consideration both the quantity and quality of the generated waste to determine the generation rates and physical properties of healthcare waste (HCW) in Chittagong Medical College Hospital (CMCH) and also to estimate the amount of infectious and non-infectious waste generated in different wards. CMCH, the second largest hospital in Bangladesh, comprises 34 wards, 12 of which were selected randomly. Waste materials were collected from these wards and then segregated and weighed. Waste generation per day was found to be 73.22 kg/ward, 1.28 kg/bed and 0.57 kg/patient. A total of 2490 kg of HCW was produced each day in CMCH (37% being infectious and the rest being non-infectious waste). Infectious waste was 27.07 kg per ward, 0.47 kg per bed and 0.21 kg per patient and the non-infectious waste was 46.15 kg per ward, 0.81 kg per bed and 0.36 kg per patient per day. HCW comprised eight categories of waste materials with vegetable/food waste being the largest component (50.21%) and varied significantly (P < 0.05) among the 12 different wards studied. The greatest amount of HCW was recorded (154 kg) in Orthopaedics followed by 96.66 kg in the Medicine Unit-3 and the smallest amount was recorded in Casualty (8.79 kg). The amount of HCW was positively correlated with the number of occupied beds (rxy = 0.79, P < 0.01). There is no structured form of medical waste treatment in CMCH and most waste materials are dumped in open areas for natural degradation or re-sold by scavengers. It is essential to develop a national policy and implement a comprehensive action plan for HCWM that will provide environmentally sound technological measures to improve HCWM in Bangladesh. 相似文献
36.
Mahbub Alam Todd P. Trooien Troy J. Dumler Danny H. Rogers 《Journal of the American Water Resources Association》2002,38(6):1715-1721
ABSTRACT: A test of the suitability of subsurface drip irrigation (SDI) for alfalfa (Medicago sativa L) compared to a sprinkler, was conducted on a Kansas producer's field where the soil is loam. The treatments included drip tape spacing of 60, 40, and 30 inches placed at depths of 18 and 12 inches. A nearby plot irrigated by a center pivot sprinkler was seeded to alfalfa and used for comparison. Seedling emergence and yield were adversely affected at 60 inch spacing, while the depth of placement of drip tapes (18 and 12 inches) showed no effect on yield. The site served for education and allowed comparison between SDI tape spacing and center pivot system. 相似文献
37.
Alam Absar Kumar Jeetendra Sarkar Uttam Kumar Jha Dharm Nath Srivastava Saket Kumar Kumar Vijay Das Basanta Kumar 《Environment, Development and Sustainability》2021,23(9):13221-13241
Environment, Development and Sustainability - The present study evaluated the effectiveness of stocking the Gangetic carps, viz. Labeo catla, Labeo rohita, and Cirrhinus mrigala, in a large... 相似文献
38.
Rehman Alam Ullah Irfan Afridi Fakhr-e-Alam Ullah Zain Zeeshan Muhammad Hussain Arif Rahman Haseeb Ur 《Environment, Development and Sustainability》2021,23(9):13200-13220
Environment, Development and Sustainability - Banking industries are blamed to be among the major factors that affect global climate change both directly and indirectly. The green banking concept... 相似文献
39.
Mahbubul Alam Yasushi Furukawa Kazuhiro Harada 《Environment, Development and Sustainability》2010,12(2):147-158
The tropical deciduous forest in Bangladesh provides a substantial part of country’s forest and where the government has introduced
participatory agroforestry landuse. This study examined management issues, financial viability, and environmental as well
as social sustainability of this landuse system. The forest department allocated a plot of size 1.0 ha among the selected
participants where they were allowed to practice agriculture as well as to plant tree species for 10 years. The financial
indicators indicated that the landuse system was profitable and attractive [net present value (NPV) = US$ 17,710 and benefit-cost
ratio (BCR) = 4.12]. It was also viable and suitable from the social and environmental stand points. The study concluded that
under the present environmental and socio-economic scenario, this production system could be the best management tool that
would earn money, stop forest degradation, and finally be a model of sustainable land management in an overpopulated country. 相似文献
40.
Alam JB Hossain A Khan SK Banik BK Islam MR Muyen Z Rahman MH 《Environmental monitoring and assessment》2007,134(1-3):233-242
Surma River is polluted day by day by human activities, poor structured sewerage and drainage system, discharging industrial
and household wastes. The charas (natural channels) are responsible for surface runoff conveyance from its urban catchments
to the receiving Surma River. Water samples have been collected from a part of Surma River along different points and analyzed
for various water quality parameters during dry and monsoon periods. Effects of industrial wastes, municipal sewage, and agricultural
runoff on river water quality have been investigated. The study was conducted within the Chattak to Sunamganj portion of Surma
River, which is significant due to the presence of two major industries – a paper mill and a cement factory. The other significant
feature is the conveyors that travel from India to Chattak. The river was found to be highly turbid in the monsoon season.
But BOD and fecal coliform concentration was found higher in the dry season. The water was found slightly acidic. The mean
values of parameters were Conductivity 84–805 μs; DO: dry-5.52 mg/l, monsoon-5.72 mg/l; BOD: dry-1mg/l, monsoon-0.878 mg/l;
Total Solid: dry-149.4 mg/l, monsoon-145.7 mg/l. In this study, an effort has been taken to investigate the status of concentration
of phosphate (PO−4) and ammonia–nitrogen (NH4–N) at four entrance points of Malnichara to the city, Guali chara, Gaviar khal and Bolramer khal. Data has been collected
from March–April and September–October of 2004. Concentrations have been measured using UV Spectrophotometer. Although the
phosphate concentration has been found within the limit set by DOE for fishing, irrigation and recreational purposes, however
ammonia–nitrogen has been found to exceed the limit. 相似文献